Muffler



July 17, 1928.

c. E. STADE MUFFLER Filed June 25, 1924 exhaust pipe. An annular sheet metalcasby way of example one o Patented July 17, 1928.

UNITED [STATES PATENT OFFICE.

cnnnnns n. STADE, on NEW YORK, N. Y.

,morrnnn.

Application filed June 25, 1924. Serial No. 722,294.

This invention relates to a muflier for use in connection withinternal combustion en are peculiarly baflled and directed into agradually enlarging passageandthereby retarded against an increasing cooling surface.

Another object of the invention is to provide a muffler wherein the gas stream 18 reversed and permitted to expand several times before emission to atmosphere, thereb thoroughly mixing the gas stream and 3.1' in in reduction of the temperature thereof. %)ther objects ofthe invention are to'improve generally the simplicity and efiiciency of such devices and to provide a device of this kind which is durable, economical to manufacture and operate and which will not easily get out of order.

The inventive featuresfor the accomplishment of these and other objects are embodied in an improved muflier which, briefly stated, comprises a casing and a bafiied member mounted on an exhaust pipe of an engine and together form a conducting passage extending from said ipe laterally, outwardly, backwardly, and t en forwardly with 1ncreasing cross-section. A second casmg member and a second baffle member to ether form a conducting passage from sai first passage and extend "forwardly with gradually diminishing cross-section, then backwardly and inwardly and forwardly.

Other objects of the invention will appear as the description proceeds; and while herein details of the invention are described, the invention is not limited to these, since many and various changes may be made without departing from the scope of the invention as claimed. 1

In the accompanying drawing, showing f many possible embodiments of the invention, Fi 1 is a longitudinal vertical view of my evce, partly in sectional elevation;

Fig. 2 is a view on the line 22 of Fig. 1, lookin in the direction of the arrow.

As s own in Fig. 1 my device comprises an exhaust pipe 11 of an internal, combustion engine and an enlarged discharge pipe 12 coaxial with, but spaced apart from, said ing member, generally denoted by 15, the

central portion of which is formed into a sleeve 16, is received on the end of said exhaust pipe 11 and curved outwardly and rearwardly end of said exhaust pipe 11, and then forwardly and outwardly, forming a forwardly opening trough and extending to a plane 21 about midway between the ends of said pipes 11 and 12, and terminating in an outwardly extending flange 22. e

to a point 17 to the rear of the A bafiie member, generally denoted by 25,

having a hemispherical or cup-like central portion 26, is disposed adjacent the open end of said exhaustpipe 11 for directing outwardl and then backwardly, out-coming gas, t e rim of said cup-like portion 26 extending backwardly into said trough 20 and forming with said casing 15 a restricted area 31 therebetween. The member 25 then continues forwardly and outwardly forming with said casing annular passage 32 and terminates in a lateral flange 35 of greater width than first said flange 22, the outer portion of flange 35 engaging flat against said first flange 22 and the inner portion being provided with elongated openings 36, Fig. 2, approximately equal in area to, and forming outlets from, said passage 32. l

A second bafiie member, generally denoted by 40, having a hemispherical or cup-like central portion, 41, is disposed adjacent the inlet end of said discharge pipe 12 for directing the outgoing gases therethrough, and then extends outwardly and forwardly to a point 42 slightly in advance of said discharge pipe 12 and forms therewith a backwardly opening trough 43. From point 42 baffle extends backwardly and outwardly and terminatesin a lateral flange 45 engaging flat against said flange 35 and having openings 46 registering with said elongated openings 36.

A second annular sheet metal casing member, generally denoted by 50, having its inner edge portion forming a sleeve 51, is received on the end of said discharge pipe 12, the outer portion being curved outwardly, as'at 53, and then rearwardlyoutwardly, as at 54, and forming with said second bafile member 40 a gradually enlarging annular passageway and terminating in a lateral flange 56 disposed against the flange 45 of said second bafiie member 40.

Bolts 60 passing through said flanges 32, 35, 45 and 56 clamp said casing members and 15 a gradually enlarging baflie members rigidly and tightly together.

The operation of my device is as follows:

The gases coming out of pipe 11 strike the portion 26 of bafile member and are reversed and directed into the annular passage 31, and then into the trough 20, again being reversed and mixed and rolled against the cooling surface at 17, and then into the enlarging passage 32 where the flow is less rapid and where the cooling surface becomes greater. The gases continue through the openings 36 and 41 through the diminishing passage 55 into the trough 43 where they are again reversed and again mixed and directed against the cup-like portion 41 of bafile member 40, again reversed and go out through pipe 12 to atmosphere.

It is understood, of course, that my mufller may be of suflicient size to reduce the temperature of the gases passing from pipe 11 to pipe 12, or a series of mufiiers may be employed.

Having claim:

1. A mufller of the class described, comprising, in combination with spaced ends of two pipes, a substantially cylindrical outer casing; and a spaced inner baflle member, the last -mentioned member having reversed semispherical walls therein and having cylindrical walls spaced within the outer casing and having means thereon to engage the casing for intermediate support.

2. A muflier of the class described, comprising, in combination with spaced ends of two pipes, a substantially cylindrical outer casing made in two parts; and a spaced two part inner baflle member, the last mentioned member having reversed semispherical walls therein and having cylindrical walls spaced within the outer casingand having means thereon to engage the casing for intermediate support.

3. A mufller of the class described, comthus described my invention, I

prising, in combination with spaced ends of two ipes, a two part flanged cylindrical casing aving pipe engaging means on opposite ends, and a two part flanged inner baflie member having reversed semispherical walls therein and having cylindrical walls spaced within the outer casing, the flanges of the casing and baflle member being joined together for supporting each other in operating position.

4. A mufiier of the class described, com-' prising, in combination with spaced ends of two ipes, a two part flanged cylindrical casing aving pipe engaging means on opposite ends, and a two part flanged inner baflie member having reversed semispherical walls therein, the flanges of the casmg and bafiie member being joined together for supporting each other in operating position, the flanges of said inner baffle bein apertured to provide a gas passage theret rough.

5. A mufiier of the class described, comprising, an outer casing composed of two metal flanged'shells provided with pipe engaging apertures, means on the flanges for connecting the shells together, an inner bafile composed of two substantially cylindrical shells s aced within the outer casing and having owl-like baflie walls arranged thereon, and perforated flanges on said bafiie having means thereon to cooperate with the flanges on the casing whereby to look all of said shells in operative relation.

6. In combination, a combustion engine exhaust pipe; a discharge pipe adjacent said exhaust pipe; an annular casing member havin a central sleeve portion received on said ex aust pipe anda portion extending out-- wardly therefrom curved, forwardly and rearwardly and terminating in a flange; a baflie member disposed adjacent the end of said exhaust pipe and forming with said casing a gradually enlarging annular'passage, and terminating in a flange of greater width than said first flange and having its outer portion disposed against said first flange and its inner portion provided with openings; a second bafiie disposed adjacent the end of said dischar e pipe extending outwardly and rearwardfly and then terminating in a flange having wardly'an-d istering with the openings 1n openings re the flange 0 her; and a second casing member having a central sleeve portion received on said discharge pipe and a portion extending outwardly therefrom curved outwardly and forwardly and terminating in a flange disposed against the flange of said second baflle member, and forming with said second baflle member a gradually enlarging passage from said discharge pipe.

' 7 In combination, the exhaust pipe of an internal combustion engine; an enlarged discharge pipe coaxial with but spaced apart from said exhaust pipe; an annular sheet metal casing member, the central portion of which is formed into a sleeve received on the end of said exhaust pipe, said casing .then curving outwardly and forwardly to a forward of the end of said exhaust then rearwardly and outwardly and thereby forming a rearwardly opening trough extending to a plane about midway between the ends of said pipes, and terminating in an outwardly extending flange; a baflie member having a hemispherical or cup-like central portion disposed adjacent the open end ofsaid exhaust pipe for direct-' ing incoming gas outwardly and then forwardly, the rim of said cup-like portion extending forwardly into said trough and forming with said casing a restricted area therebetween,' and then continuing rearwardly and outwardly and forming witl said casing a gradually enlarging annulai point for- 1 the first mentioned baffle mempassage and terminating in a lateral flange of greater width than the first mentioned flange, the outer portion engaging flat against said first flange and the inner portion being provided with elongated openings therein approximately equal in area to, and forming outlets from, said passage; a second bafile member having a hemispherical or cup-like central portion disposed adjacent the inlet end of said discharge pipe for directing the outgoing gases therethrough and extending outwardly and rearwardly to a point slightly in advance of the inlet of said discharge pipe, and then forwardly and outwardly and terminating in a lateral flange engaging fiat against said second flange and having openings registering with said elongated openings; a second annular sheet' metal casing member having its inner edge portion forming a sleeve received on the end of said discharge ipe, the intermediate portion being curved outwardly outwardly and forming with said second baflle member a gradually enlarging annular passageway and terminating in a lateral flange portion disposed against the flange of said second bafile member; and bolts passing through vsaid flanges for clamping said casing members and baflle members together.

Signed at New York in the county of New York and State of New York this 24th day of June, A. D. 1924.

CHARLES E. STADE.

and then forwardly 

